CN101044361B

CN101044361B - Compressor loading control

Info

Publication number: CN101044361B
Application number: CN2005800360951A
Authority: CN
Inventors: J·W·布什
Original assignee: Carrier Corp
Current assignee: Carrier Corp
Priority date: 2004-08-20
Filing date: 2005-08-19
Publication date: 2012-11-28
Anticipated expiration: 2025-08-19
Also published as: US20060037336A1; JP2008510953A; EP1800069A2; CN101044361A; KR20070048235A; AU2005277189B2; AU2005277189A1; WO2006023830A3; AU2005277189A2; EP1800069A4; US7325411B2; WO2006023830A2

Abstract

A system has a number of parallel flowpath segments between a compressor and an evaporator. One or more valves selectively block and unblock at least one of the segments to provide capacity control.

Description

Compressor load is regulated

Technical field

The present invention relates to compressor, in more detail, the present invention relates to the compressor unloading in air conditioning or refrigerating system.

Background technology

In the air handling system of closure or refrigerating system, there is the method for plurality of discharging to use; The United States Patent(USP) No. 4 of co-assigned; 938; 666 disclose through the gas bypass pipe and have made a cylinder unloading in the cylinder combination, and make all methods of unloading of cylinder combination through breaking off intake line.The United States Patent(USP) No. 4,938,029 of co-assigned discloses the method for using of whole compressor unloading and a kind of economizer.The Patent No 4,878,818 of co-assigned discloses the common aperture of using valve and has been connected with suction line so that be used for unloading or being connected so that be used for controlling Vi with discharge pipe, and Vi is the ratio of discharge pressure and suction pressure here.When using these diverse ways, the structure of valve is normally opened fully, closes fully, and perhaps the opening degree of valve is adjustable so that remain on a fixing position.The United States Patent(USP) No. 6 of co-assigned; 047; 556 (' 556 patents; Its disclosure combines to be described in detail in this article by reference) use of some magnetic valves is disclosed, these magnetic valves are opening fully and alternating movement fast between the closing position fully, so that the control of capacity is provided.The magnetic valve of this alternating movement can be placed in the intake line of compressor, in the bypass duct of the economizer line of compressor and/or compressor that economizer line is connected with intake line.Valve is opened shared percentage decision of time and is accomplished the degree of regulating.

But still there is further room for improvement in this technology.

Summary of the invention

One aspect of the present invention relates to a kind of like this device, and this device comprises the compressor with inlet hole and tap; Evaporimeter; A plurality of this inlet hole and parallel connections between this evaporimeter at this compressor return the flow channel part; And the one or more valves that are used for closing selectively and connecting this flow channel at least one part partly, the first of this channel part does not have such valve; Be connected to the controller on first valve of this valve or a plurality of valves, this controller is controlled duty cycle and at least one in the frequency of the adjusting of this first valve according to program.

In other respects, these one or more valves are two stationary valves.This device also comprises: condenser, this condenser are connected between this tap and this evaporimeter of this compressor.It is long-pending that at least the first and second parts can have the first and second different effective cross sections respectively in this flow channel part.At least the first and second parts can have the first and second identical cross-sectional areas respectively in this flow channel part.

The present invention also proposes a kind of method that is used to operate said apparatus, and this method comprises measures at least one running parameter; And, confirm to be used at least one adjusting parameter of these one or more valve at least the first valves according to this mensuration.

In other respects, this at least one running parameter is at least one parameter in the following parameter: saturated evaporating temperature; Saturated evaporating pressure; Get into or leave the air themperature of evaporator coil; Saturated condensation temperature; Saturated condensing pressure; Get into or leave the air themperature of condenser; Compressor current; Compressor voltage; And compressor horsepower; And this confirms to comprise the identity of definite first valve of identification from a plurality of valves.

The present invention also proposes a kind of refrigeration or air handling system, and this system comprises compressor; Condenser; Discharge pipe, this discharge pipe is connected this compressor with this condenser, so that refrigerant is transported to this condenser from this compressor; Expansion gear; Evaporimeter; Suction line, this suction line is connected this evaporimeter with this compressor, so that refrigerant is transported to this compressor and comprises the first and second parallelly connected parts from this evaporimeter; Electric actuated valve in this first; Thereby be used for making in this first this electric actuated valve fast pulsation regulate the device that flows to the flow rate of this compressor in this suction line; Flow channel, this flow channel extend to one of the compressor corresponding position, centre position with compression in this compressor from the centre position of this condenser and this expansion gear; The bypass pipe that connects this fluid passage and this suction line; Electric actuated valve in this bypass pipe; Thereby be used for making the quick pulsation of this electric actuated valve in this bypass pipe to regulate the device that this bypass pipe flows to the flow rate of this suction line; The economizer circuit that is connected with this fluid passage; Electric actuated valve in this economizer circuit; Thereby be used for making the quick pulsation of this interior electric actuated valve of this economizer circuit regulating economy device loop to flow to the device of the flow rate of this compressor.

In other respects, this suction line comprises the third part parallelly connected with first and second parts; And the electric actuated valve in this first is first magnetic valve, and this system is included in second magnetic valve in this second portion.

The present invention further proposes a kind of method that is used for operating means, and wherein, this device comprises the compressor with inlet hole and tap; Evaporimeter; A plurality ofly return the flow channel part what this compressor was sent out parallel connection between this inlet hole and this evaporimeter; And the one or more valves that are used for closing selectively and connecting this flow channel at least one part partly; Wherein this method comprises: operate this compressor so that drive refrigerant and flow through this evaporimeter; Measure at least one running parameter; And, confirm to be used at least one adjusting parameter of these one or more valve at least the first valves according to this mensuration; On the gamut of operate as normal, regulate this first valve of these one or more valves, so that restriction is along the part that flows of relevant portion; Do not regulate the restriction of at least one part on the gamut of this operate as normal.

The present invention further proposes a kind of device, and this device comprises the compressor with inlet hole and tap; Evaporimeter; A plurality of this inlet hole and parallel connections between this evaporimeter at this compressor return the flow channel part; And the one or more valves that are used for closing selectively and connecting this flow channel at least one part partly; The control system is connected to this and states on one or more valves, and is configured to these the one or more valves of gamut adjusted in operate as normal, and does not regulate the restriction along first.

The details of one or more embodiment of the present invention will be below accompanying drawing with detail in illustrate.Other characteristics of the present invention, purpose and advantage are through detailing, and accompanying drawing and claim will be clearer.

Description of drawings

Fig. 1 is to use the sketch map of economical freezing or air handling system of the present invention.

Fig. 2 is the part sketch map of the intake line that replaces that is used for the system of Fig. 1.

Label identical in different drawings is represented identical part with title.

The specific embodiment

Fig. 1 shows a kind of freezing or air handling system 10 of the typical closure that is the basis with ' 556 patents.This system has the compressor 12 of sealing, and compressor discharge line 14 extends to condenser 16 downstream from this compressor.Intermediate conduit 18 extends to expansion gear 20 and evaporimeter 22 downstream from this condenser.Intake line 24 extends to this compressor downstream from this evaporimeter, thereby has accomplished major loop/flow channel.

In order to form a bypass economizer circuit/flow channel, pipeline 27 comes out from pipeline 18 branches, and this pipeline is equipped with expansion gear 30, and one with compression process in corresponding position, centre position on be connected with compressor 12 through hole 32.Economizer heat exchanger 40 is provided with like this, makes to be in heat exchange relationship at the pipeline 27 in expansion gear 30 downstream and the pipeline 18 at expansion gear 20 upper reaches.

Typical expansion gear

20 and 30 is electronic expansion device (EEV), they respectively through control line 45 and 46 and the control system 44 (for example, with the microprocessor being basic controller) that is used for accepting to control input signal be connected.Typical control system 44 can accept such as from the ground domain input signal of one or more sensors 47 and from the external control input signal of one or more input units (for example, thermostat 48).By-pass line 50 is connected with 24 with the pipeline 27 of economizer heat exchanger 40 with evaporimeter 22 downstream respectively.Magnetic valve 52 is arranged on the pipeline 50, and is connected with control system 44 through control line 54.Magnetic valve 56 is arranged on the pipeline 27, and is connected with control system 44 through control line 58.

Above though EEV 20 has been detailed, any different expansion gear can use (for example heating power expansion valve (TXV), fixed orifice or capillary).Though magnetic valve has been detailed, other electric actuated valve also can use.And other valves (pressure-actuated valve of for example, being controlled by electric actuated valve) also can use.

In this typical embodiment, intake line 24 has formed a pair of parallelly connected

flow channel part

60 and 62 in the downstream of evaporimeter 22 with pipeline 50 crossing upper reaches bifurcateds.In this typical embodiment, magnetic valve 64 is arranged in the first 60, and is connected with control system 44 through control line 66.Fixing current limiter 68 is arranged on the second portion 62.This current limiter is suitable for, and for example the characteristic cross-section of employed pipe amasss above partly provide for relevant flow channel the occasion of required net sectional area.Thus, this current limiter will provide required net sectional area.

Under the normal non-economy type duty of system 10,

valve

52 and 56 cuts out, and infeeds condenser 16 from the high pressure cooling gas of the heat of compressor 12 through pipeline 14, and is condensed into liquid therein.This liquid infeeds among the EEV 20 through the economizer heat exchanger 40 of pipeline 18 with idle running.EEV 20 has caused from the pressure of the liquid refrigerant that wherein passes through and has fallen and local flash.This liquid-vapour mixture is infeeded evaporimeter, and liquid refrigerant evaporates therein, thereby with the cooling of needed space, synthetic then gas refrigerant infeeds in the compressor reducer through intake line 24, thereby has accomplished major cycle.

Above the described course of work be general process; The refrigeration output of this system can controlled routinely through the opening and closing that change compressor, and the opening and closing of compressor are carried out according to the input signal from thermostat or other control systems usually.According to principle of the present invention, magnetic valve 64 can open and closed condition between pulsation promptly so that regulate the capacity of compressor 12.Adjusting can be in the percentage of the time of opening and closing state through control valve 64 and realize.

In a typical embodiment, for the sake of security, valve 56 is a normally close valve (that is, when no power, it is closed, and when energising, it is opened).If valve 56 often leaves, interrupt cycle period at compressor, liquid refrigerant will take place flow back to the possibility of compressor through economizer line, this situation may be damaged the flooded type starting of compressor.When outage, if valve 56 is in the generation that closed condition just can prevent this damage.In addition, if valve 56 had lost efficacy, it will make economizer circuit lose efficacy, thereby causes the reduction of system capability and efficient, still, can avoid under some duty other possible make infringement problems such as compressor horsepower reduction or liquid flow.In a typical embodiment, for the sake of security, valve 64 is normally open valves.If valve 64 fail opens, this system will still move, and system capability will mainly be controlled by compressor cycle.If valve 64 fail closes, this system will can not provide any effective cooling fully.

The operation of valve 64 is similar to a square wave, its fraction time is opened be defined as duty cycle, and the frequency of opening/closing is defined as cycle frequency.The inertia that influences the actuation time of valve may make the shape of this ripple a bit level and smooth with other factors.In off position down, valve 64 will be lived through the flow blockage of first 60 fully.Restriction in second portion 62 is effective for being restricted to the power-carrying of system required minimum (for example, in the scope of 1-30%).For example, 1% for preventing that the corona discharge in the scroll compressor from possibly be sufficiently high.30% capacity regulating for the floor level in system possibly be the rational upper limit.When valve 64 was opened, the combination of first 60 or first and

second parts

60 and 62 was effective for required heap(ed) capacity (for example, 100%) is provided.It is effective that the duty cycle of valve 64 is regulated for the continuous capacity regulating that is provided between these two numerical value.In a typical embodiment; This minimum of a value can be a very little value (for example; 1-2%), its effect can only prevent the infringement with the pass of high vacuum during the of short duration time interval, and valve 64 is in closed condition or is under the failure conditions of closed condition at that time.So allow (for example, all to regulate in 2-100%) in above-mentioned scope.As stated, if not need this scope than lower part in work, this minimum of a value can be higher value.

Valve 52,56 and 64 independent circulation are convenient to carry out various forms of capacity regulating, and nationality is decided the regulating degree of capacity with respect to the size of shut-in time by the time of opening of a specific valve.The regulating frequency scope of canonical system is 0.1 to 100 second.

For the capacity that increases system has used economizer heat exchanger 40.In the whole economy device course of work, valve 56 is opened, and valve 52 cuts out, and valve 64 is opened.Intake line 24 and economizer line 27 are the same all to be opened.These two pipelines are sent to possible biggest quality flow rate in the compressor.To in evaporimeter, produce possible maximum heat capacity like this.A part of liquid refrigerant of the entering pipeline 18 of discharging from condenser 16 is imported into pipeline 27, and makes this liquid refrigerant produce a pressure by EEV30 to fall and local flash.The liquid refrigerant that this pressure is lower gets into economizer heat exchanger, and the refrigerant draw heat of the refrigerant in this heat exchanger interior conduit 27 from pipeline 18, thereby the latter is further cooled off, and the cooling effect that increases is provided in evaporimeter thus.Infeed in the compressor 12 through hole 32 under the control of valve 56 through the refrigerant in the pipeline 27 of economizer heat exchanger, subsequently the control of controlled again system 44.Pipeline 27 is sent to holding back in the volume in compressor with refrigerant gas in the interstage of compression.

Under normal non-economy type duty, valve 56 cuts out, and valve 52 cuts out, and valve 64 is opened.Economizer circuit is closed, and it does not provide additional cooling to the liquid refrigerant upper reaches of EEV20.This will cause the loss of the capacity in the evaporimeter 22, even the mass flowrate through evaporimeter 22 is because the intake line of all opening 24 keeps quantity much at one.Depend on condition of work a little, this system can constitute like this, makes the 110-200% that Eco-power basic capacity can the economical basic capacity of right and wrong.This interrelates with application scenario as air-conditioning than low value, and the application scenario of median and heat pump interrelates, and high value then interrelates with the application scenario of refrigeration.

In order to reduce the capacity of this system, used the magnetic valve 52 on the by-pass line.Under the bypass mode duty, valve 56 cuts out, and valve 52 is opened, and valve 64 is opened.Some refrigerant that gets into compressor through intake line 24 is discharged from compressor through hole 32, and turns back to suction line 24 through the forefield of pipeline 50 and pipeline 27.This flowing will be discharged some refrigerant flow rate suction line 24 from evaporimeter.Therefore, all reduce through the mass flowrate of evaporimeter and the thermal capacity of evaporimeter.The capacity of this minimizing can be the 50-70% (higher in some cases) of typical normal capacity.

Sucking under the duty of ending, valve 56 cuts out, and valve 52 is opened, and valve 64 cuts out.Capacity is lowered to the minimum of a value that is limited current limiter 68.This capacity possibly be slightly less than the minimum of a value under the duty of normal non-economy type.

The adjusting of any one valve in three

valves

52,56 and 64 can be accomplished separately, and is under a kind of state in the three kinds of main duties duty of bypass (economic, normal and).In a basic embodiment, only once, and only be under a kind of state in these three kinds of states a valve regulation.Say that exactly valve 56 will be adjusted under the economical duty, so that range of capacity is transferred to unadjusted normal operating conditions from unadjusted economical duty.Economic flow rate in pipeline 27, and like this, power system capacity can be through making valve 56 Rapid Cycle, thereby the size of regulating the economic flow rate in the interstage of compression in the compressor is regulated.

For range of capacity is transferred to unadjusted bypass duty from unadjusted normal operating conditions, should valve 52 be adjusted to normal operating conditions.In this configuration, valve 56 cuts out, and the gas under intermediate pressure is from compressor, and through hole 32, pipeline 27 gets in the intake line 24 with pipeline 50.The quantity of bypass gas, and like this, the capacity of system will change owing to the Rapid Cycle of valve 52.Therefore, use as by-pass prot or unloading hole again both as economizer port in hole 32.

For range of capacity is transferred to unadjusted suction cease operation state from unadjusted bypass duty, should valve 64 be adjusted to the bypass duty.

Many variations aspect parallel-connection structure are possible.Fig. 2 shows the other one group of flow channel part 100,102,104 and 106 in pipeline 24.In this typical embodiment, channel part 100,102 and 104 has magnetic valve 110,112 and 114 separately, and control corresponding line 116,118 is connected these valves with 120 with control system 44.In this typical embodiment, channel part 102,104 and 106 has current limiter 122,124 and 126 separately.In this typical embodiment, first passage part 100 has fully effectively cross section, and it can provide 100% capacity and irrelevant with the state of other channel parts.But another way is that it can be less.In this typical embodiment, remaining channel part all lacks this cross section with combining separately.The selection of the size of current limiter should be convenient to specific job order, and its maybe (at least a portion) depends on the condition of work (compressor is expected on each position in this range of capacity and how long works, between these states needed transformation etc.) of expection.In a typical embodiment, flow channel 106 is a residual flow channel just, and it only has very little capacity, is used for protecting this compressor.In this typical embodiment, current limiter 122 and 124 size should be able to make under the situation that first (mainly) valve 110 cuts out: the (1) second and the 3rd valve 112 and 114 is opened, and combining passage part 102 and 104 can provide 2/3 capacity to system; And (2) valve 112 cuts out with valve 114 and opens, and channel part 104 can provide 1/3 capacity to system.In order to realize capacitance balance, current limiter 112 and 124 size are owing to the influence that pressure changes needs different.Relevant current limliting size can obtain through Theoretical Calculation or repeated experiments, distributes so that realize required capacity.In a typical duty, the adjusting between all told and 2/3 capacity can realize through only regulating main valve 110 and the second and the 3rd valve 112 and 114 being opened.Because when main valve is closed, compressor is only fallen 2/3 capacity, and is slower when the reaction of system is closed than all capacity.Therefore, main valve can circulate more lentamente.This circulation lentamente itself can life-saving and raising reliability.In addition, capacity will be reduced under zero the situation basically, and can use firmer valve, but not need to circulate more quickly closing of main valve.Territory, secondary service area between 1/3 and 2/3 capacity, main valve 110 is closed, and the 3rd valve 114 is opened, and second valve 112 is adjustable.In this zone; Bypass flow rate through third channel part 104 defines required circulation rate; Thereby help the life-time dilatation of second valve 112, when working in the first area, bypass helped the life-time dilatation of main valve 110 the same through second channel part 102 with 104 o'clock.In the 3rd zone between minimum capacity and 1/3 capacity, the main valve and second valve all are closed, and the 3rd valve 114 is adjustable.

Usually, the measurement or the input of first group of parameter need, so that confirm required power system capacity.They also can be used for confirming required duty (for example, need that valve in valve 110,112 and 114 be opened, or close, or work/adjusting).Also need second group of parameter to come the virtual condition of detection system and the circulation of adjusting operating valve then.Second group of parameter can be identical or even equal with first group of argument section.For example, need can confirm power system capacity to be in certain scope from the input signal of thermostat.This input signal not only can comprise the temperature of the conditioned space relevant with setting value (it is " traditional " automatic temperature-control role), but also can comprise the relevant information that makes the system that is operated in certain range of capacity react the temperature (and possibly be humidity) of conditioned space with speed how soon.Under a typical state, house-owner people went home a hot day, came a greenhouse, and had opened air handling system.Gap between greenhouse temperature and thermostat setting value is bigger, cools down in order to make greenhouse apace, and system should be in heap(ed) capacity (all valves are all opened) work down.Because the work of system, the temperature of greenhouse will descend, and near the setting value of thermostat.At this moment, controller cuts out valve 110, and continues to make system under 2/3 capacity, to work.If it is higher than setting value that temperature begins again to rise to once more, controller will be opened valve 110, and temperature is reduced, and system will circulate between all told and 2/3 capacity, so that keep indoor temperature in required scope.Under a typical state; Valve 110 will be with a complete connection/cut out circulation to circulate quite lentamente; This circulation has comprised a few minutes until 1 hour most of or time more of a specified duration, depends on the load coupling this circulation timei, promptly; Balance between thermic load of system (under the situation about for example, being cooled in the room) and the cooling capacity.If enough parallel branches (embodiment of Fig. 2 just has enough branch roads) are arranged, in some system, just do not need the Rapid Cycle of valve.Under situation with enough parallel branches, each other maybe be very approaching through opening or closing the capacity increase that a valve (i.e. branch road) once obtained, thereby system is to the reaction of the smaller variation of capacity very slowly.

Make system have 2/3 capacity if temperature continues to drop to, controller cuts out valve 112 and system is worked under 1/3 capacity.If not enough like this so that this room remains on setting value, controller will be to make valve 112 circulations with valve 110 identical mode under situation early.Except temperature swing is so not fast (because system is always in required certain capacity operation down near it), this situation is similar with the work of the thermostat of routine.System also can work under higher cycle efficieny owing to capacity reduces.Conventional thermostat has two temperature extremes usually: a lower limit, and system will close at this lower limit; A upper limit, system will bring into operation in this upper limit.The setting value that variable-displacement work also need add (for example, one is higher than the normal upper limit, a subnormal lower limit).These additional limit will be used for signaling to controller, so that 0 to 1/3,1/3 to 2/3, and 2/3 change between all told.

Using more, the controller of intelligence can provide the more work characteristic.According to regulating the speed of the variations in temperature of circulation time when system near setting value or through one or two, controller can estimate about 80% capacity of needed all told.In this case, can use the duty cycle of the power system capacity of realization about 80% to handle this valve 110.When controller continue to detect speed or the stability of the variations in temperature in the room, controller can also improve this estimation and relevant duty cycle (for example, to 75% of power system capacity, the rest may be inferred).After several days, when the temperature of outside cooled off, the needed capacity of system possibly drop to below 2/3, and controller can be transformed into intermediateness with work.

Work under the situation of using this basic controller to close in 100% time of valve, just can produce the effect in this room of continuous cooling simply.When temperature is fallen second setting value (it is more a little bit smaller than first setting value) when following; Except that valve 112 and 110; Controller is also with shut off valve 114, and when room temperature rose and drop in the limit of thermostat setting value, controller began to make valve 114 to circulate.More the controller of intelligence can calculate and estimate needed capacity and corresponding work duty cycle, and keeps the strict more control of setting value, so that make the variations in temperature in the room reduce to minimum.Till now, in this case, unique active input signal of two kinds of controllers is temperature of conditioned space, and the setting value of thermostat all is passive input signal (a fixed reference benchmark).Controller makes the power system capacity circulation perhaps change the duty cycle of valve according to the minor variations of indoor temperature.In this case, first and second groups measure be identical-all be indoor temperature.

Yet a kind of perfect system more can comprise the input signal of outdoor temperature; So that in advance the required power system capacity of stable circulation is produced better estimation; And before the indoor temperature change of reality, the variation of closing combination of prediction loop speed and valve.It can also comprise pressure or measured temperature in system evaporator and/or the condenser; So that confirm real system capacity this moment; Thereby can before the indoor temperature change of reality, more promptly set and control correct capacity and predict needed adjustment.In this case, first group of input signal will be the indoor and outdoors measured temperature, and second group of input signal will be indoor temperature measured value and system pressure and/or temperature.

In some state at least in these duties, it possibly be quite long regulating required frequency.If open and close the standard of a valve is the direct variation of indoor temperature; As such for the described situation of simple controllers more; Be enough to make before valve opening/closing state changes in variations in temperature, the thermal inertia-house, space that is cooled may make a kind of or other many minutes of a kind of valve work in combination or more time.In addition, should also be noted that when more valve be increased in the system and more power system capacity increase become available after, required regulating frequency will descend.This maybe be more much longer than top determined typical 100 seconds.To have the highest frequency of adjusting for the simplest situation shown in Fig. 1, have only a valve 64 to be regulated this moment in intake line.

In a further embodiment, more complicated control is possible, and wherein, dynamic factors may influence that valve or combination is adjusted to given any capacity.For example, the size of current limiter confirm 60% capacity can alternately be realized: through only regulating main valve; Perhaps under the situation that main valve is closed, through regulating a valve in other valves.During downward short time offrating, have only the adjusting of first valve to proceed, to avoid the use of second valve from higher capacity (for example, in 70% positive scope).

One or more embodiment of the present invention has been described above.But, only should be pointed out that otherwise break away from the principle and scope of the present invention, can carry out various modifications to this.For example, when as the modified version of existing system or when revising design and implementing, the CONSTRUCTED SPECIFICATION of existing system will seriously influence the details of this embodiment.Therefore, other embodiment also belongs in the scope of equivalent structures book.

Claims

1. one kind freezes or air handling system, and said system (10) comprising:

Compressor (12);

Condenser (16);

Discharge pipe (14), said discharge pipe is connected said compressor with said condenser, so that refrigerant is transported to said condenser from said compressor;

Heat exchanger (40)

Expansion gear (20);

Evaporimeter (22);

The intervalve (18) that successively said condenser and said expansion gear is connected with said evaporimeter through said heat exchanger;

Suction line (24), said suction line is connected said evaporimeter with said compressor, so that refrigerant is transported to said compressor from said evaporimeter;

Economizer pipeline (27); Said economizer pipeline extends to a centre position compression process of said compressor from the centre position of said condenser and said expansion gear, and connects another expansion gear (30), said heat exchanger (40) and the first electric actuated valve (56) successively;

Thereby be used for making the quick pulsation of the said first interior electric actuated valve of said economizer pipeline regulating economy organ pipe road to flow to the device of the flow rate of said compressor;

The bypass pipe (50) that connects said economizer pipeline and said suction line in the downstream of the said first electric actuated valve;

The second electric actuated valve (52) in said bypass pipe;

Thereby be used for making the quick pulsation of the said second electric actuated valve in the said bypass pipe to regulate the device that said bypass pipe flows to the flow rate of said suction line;

Wherein, said suction line comprises a plurality of parallelly connected parts at said bypass pipe with the upper reaches that said suction line intersects, and in the first parallel connection part (100), is provided with the 3rd electric actuated valve (110); In the second parallel connection part (106), first current limiter (126) is set; In the 3rd parallel connection part (102), the 4th electric actuated valve (112) and second current limiter (122) are set; And in the 4th parallel connection part (104), the 5th electric actuated valve (114) and the 3rd current limiter (124) are set;

Thereby be used for making respectively in said first, the third and fourth parallel connection part said the the 3rd, the 4th and the 5th electric actuated valve fast pulsation regulate the device that flows to the flow rate of said compressor in the said suction line; And

Wherein, the said first parallelly connected part has fully effectively cross section, and it can provide 100% capacity and have nothing to do with states of other said parallelly connected parts.

2. refrigeration or method of air handling system that is used to operate described in claim 1, said method comprises:

Operate said compressor and flow through said evaporimeter so that drive refrigerant;

Measure at least one running parameter of at least one electric actuated valve in said the the 3rd, the 4th and the 5th electric actuated valve, to confirm the required power system capacity or the actual working state of said at least one magnetic valve; And

According to said mensuration, definite and input is used at least one adjusting parameter of said the the 3rd, the 4th and the 5th electric at least one electric actuated valve of actuated valve; To control the operation cycle of said the 3rd, the 4th and the 5th electric actuated valve;

Wherein, in the gamut of operate as normal, close the said the 3rd electric actuated valve, open the said the 4th and the 5th electric actuated valve, so that said third and fourth parallel port provides 2/3 capacity to said system; Perhaps close the said third and fourth electric actuated valve, open the said the 5th electric actuated valve, so that said the 4th parallel port provides 1/3 capacity to said system; Perhaps open said the the 3rd, the 4th and the 5th electric actuated valve, all told to be provided to said system.

3. method as claimed in claim 2 is characterized in that: said at least one running parameter is at least one parameter in the following parameter:

Saturated evaporating temperature;

Saturated evaporating pressure;

Get into or leave the air themperature of evaporator coil;

Saturated condensation temperature;

Saturated condensing pressure;

Get into or leave the air themperature of condenser;

Compressor current;

Compressor voltage; And

Compressor horsepower;

Wherein, the running parameter of mensuration can be identical or equal with the adjusting parameter of confirming or import.